1. 9.2 SCIENCE ELEMENTS PRESENTATION The slides of this presentation were created by the class members of Ms Russell & Ms Chan’s 9.2 Science Class 2012. Mustapha HaidarHamzeh Hanieh Mahady Elzarw Ahmed HoumayassiAmin Kabaha Bilal Hamdan Ayub MahamadHamza Mohamed Omar Kamel Adam NahasIsaac Zaouk Julio Potaua Shafic TabikhIbrahim Elali Omar Ingram (a)

7. By: Abdel Karim – Mahdy Elzarw 2,8,8,8

9. The atomic number of Helium is 2 and the Electron configuration is 2 Ordinarily a colourless, inert gas, helium glows pale peach when an electric current runs through it. A glass blower bent a tube to the shape of the letters He and filled it with pure helium. I lit it with high voltage.

11. BY: SHAFIC TABIKH potassium (K), chemical element of Group 1 (Ia) of the periodic table, the alkali metal group, indispensable for both plant and animal life. Potassium was the first metal to be isolated by electrolysis, by the English chemist Sir Humphry Davy, when he obtained the element (1807) by decomposing molten potassium hydroxide (KOH) with a voltaic battery.

18. CALCIUM BY: BILAL HAMDAN. Name: calcium Symbol: CA Atomic number: 20 Electron configuration:2,8,8,2 Uses: Calcium is essential for human nutrition. Animals skeletons get their rigidity primarily from calcium phosphate. Properties:calcium is a fairly soft metal with a shiny silver surface when first cut.

19. BERYLLIUM IS the chemical element with atomic number as 4. It is a toxic bivalent element. It is steel grey, strong, light-weight but brittle and alkaline earth metal. It is used as a hardening agent in alloys, usually beryllium copper. Of all the metals, beryllium has one of the highest melting point. Its modulus of elasticity is approximately 1/3 greater than steel. It is nonmagnetic, resists attack by concentrated nitric acid, is an excellent thermal conductivity and it is highly permeable to X-rays. At a standard temperature and pressure it resists oxidation when exposed to air.

23. OXYGEN A oxygen is an element it weights 15.9994 Full technical data At -183.0DegreeC oxygen is a beautiful pale blue liquid, but at room temperature it is a colourless gas. It's only 21% of the atmosphere-- the 21% we all need if we want to live more than a few minutes longer. The atomic number for oxygen is 8 and its symbol O.